Fix deadlock in QFSEventsFileSystemWatcherEngine.
Fix deadlock in QFSEventsFileSystemWatcherEngine.

Task: QTBUG-8522

6130b2137 makes stop() synchronize and wait for 
the worker thread to reach the end of run().

stop() was however called from the worker thread
itself in updateFiles(), leading to a deadlock.

Add the stopFSStream and CFRunLoopStop calls
directly to updateFiles(), don't wait on waitForStop.

pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,igor-sfdc/qt-wk,igor-sfdc/qt-wk